What desktop browser's features/abilities/standards needs to be offable?

Question

Let us gather in root comments some annoying things in browsers which in theory might be disabled (by implementing extra switches in settings or by removing/adding some code with further compiling on user-side).If you are in the browser developing and you understand what regular people can not understand, second level of comments is for criticism of why it is not possible or maybe for answers that it is possible with . Please share annoyances which are applicable only to both of browsers (FF+Chrome). My opinion will be in one of root comments, please sorry that my question is about desktop browsers only, I just don't want to know that surfing from either mobile browser or from single-website-app does exist.

eimrine · Accepted Answer

1. Change buffer (like when I copy some text from a website and website changes "some text" to "some text has been copied from example.com").
2. Forbid either selecting of text or using right mouse button (might be beaten with some extensions).
3. Exposing Incognito mode for letting some pesky websites show you that it doesn't serve Incognito visitors (I really do not need any history since a typical website's live-cycle is short and redesign usually breaks old links).
4. Informing that mouse cursor has left viewport (is being used in two situations: to propose to sign for a newsletter on your email if the mouse is going off the page or annoying students for not letting to google on the device they are passing an exam).
5. Hiding an ability to save images, most of the "technologies" could be outcome with dev console, but sometimes it really works so good that the simplest way is just to make a screenshot.